搞來搞去搞了很久,差點放棄走人的時候,發現竟然是這點事。。。辛酸史如下:
android6.01-----kernel4.4.36-----編譯環境ubuntu16.04
一、kernel driver
內核有4種驅動方式,usb serial、CDC ACM、Gobinet、QMI WWAN,本文選用的是usb serial和QMI WWAN兩種驅動。
1.usb serial
(1)添加模組的PID/VID。
/kernel/driver/usb/serial/option.c
如果,你添加的是EC20。那麼,註釋掉以下代碼,避免型號衝突。
/kernel/driver/usb/serial/qcserial.c
{USB_DEVICE(0x05c6, 0x9215)}, /* Acer Gobi 2000 Modem device (VP413) */
/kernel/driver/net/usb/qmi_wwan.c
{QMI_GOBI_DEVICE(0x05c6, 0x9215)}, /* Acer Gobi 2000 Modem device (VP413) */
此時,在/dev/下可以找到ttyUSB0/ttyUSB1/ttyUSB2/ttyUSB3設備節點
(2)添加零包機制
根據 USB 協議的要求, 需要添加在批量輸出傳輸過程中處理零數據包的機制。
/kernel/drivers/usb/serial/usb_wwan.c
(3)添加重置回調
當 MCU 進入掛起狀態時, 某些 USB 主機控制器/集線器將斷電或重置模式, 並且在 MCU 退出掛起/休眠模式後, 它們無法恢復 USB 設備。添加以下語句, 以啓用重新安置過程。
/kernel/drivers/usb/serial/option.c
(4)如果使用Gobinet、QMI WWAN驅動
/kernel/drivers/usb/serial/option.c
(5)添加內核模塊
[*] Device Driver
[*]USB Support
[*]USB Serial Converter support
[*]USB Driver for GSM and CDMA modems
2.QMI WWAN
(1)添加PID/VID
/kernel/drivers/net/usb/qmi_wwan.c
如果添加的是EC20型號,請註釋以下代碼。
/kernel/drivers/usb/serial/qcserial.c
{USB_DEVICE(0x05c6, 0x9215)}, /* Acer Gobi 2000 Modem device (VP413) */
/kernel/drivers/net/usb/qmi_wwan.c
{QMI_GOBI_DEVICE(0x05c6, 0x9215)}, /* Acer Gobi 2000 Modem device (VP413) */
此時,在/dev/下可以找到qcqmi0設備節點
(2)添加對原始 IP 模式的支持
Ec25僅支持原始 IP 模式 (IP 數據包未封裝在以太網幀)。因此, 當數據包發送到模塊時, 必須剝離以太網標頭, 並且從模塊接收數據包時添加。
/kernel/drivers/net/usb/qmi_wwan.c
#if 1 //Added by Quectel
#include <linux/etherdevice.h>
struct sk_buff *qmi_wwan_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
{
if (dev->udev->descriptor.idVendor != cpu_to_le16(0x2C7C))
return skb;
// Skip Ethernet header from message
if (skb_pull(skb, ETH_HLEN))
return skb;
else
dev_err(&dev->intf->dev, "Packet Dropped ");
// Filter the packet out, release it
dev_kfree_skb_any(skb);
return NULL;
}
#include <linux/version.h>
#if (LINUX_VERSION_CODE < KERNEL_VERSION( 3,9,1 ))
static int qmi_wwan_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
{
__be16 proto;
if (dev->udev->descriptor.idVendor != cpu_to_le16(0x2C7C))
return 1;
/* This check is no longer done by usbnet */
if (skb->len < dev->net->hard_header_len)
return 0;
switch (skb->data[0] & 0xf0) {
case 0x40:
proto = htons(ETH_P_IP);
break;
case 0x60:
proto = htons(ETH_P_IPV6);
break;
case 0x00:
if (is_multicast_ether_addr(skb->data))
return 1;
/* possibly bogus destination - rewrite just in case */
skb_reset_mac_header(skb);
goto fix_dest;
default:
/* pass along other packets without modifications */
return 1;
}
if (skb_headroom(skb) < ETH_HLEN)
return 0;
skb_push(skb, ETH_HLEN);
skb_reset_mac_header(skb);
eth_hdr(skb)->h_proto = proto;
memset(eth_hdr(skb)->h_source, 0, ETH_ALEN);
fix_dest:
memcpy(eth_hdr(skb)->h_dest, dev->net->dev_addr, ETH_ALEN);
return 1;
}
/* very simplistic detection of IPv4 or IPv6 headers */
static bool possibly_iphdr(const char *data)
{
return (data[0] & 0xd0) == 0x40;
}
#endif
#endif
……
/* if follow function exist, modify it as below */
static int qmi_wwan_bind(struct usbnet *dev, struct usb_interface *intf)
{
……
#if 1 //Added by Quectel
if (dev->udev->descriptor.idVendor == cpu_to_le16(0x2C7C)) {
dev_info(&intf->dev, "Quectel EC25&EC21&EG91&EG95&EG06&EP06&EM06&BG96&AG35 work on RawIP mode\n");
dev->net->flags |= IFF_NOARP;
#if (LINUX_VERSION_CODE < KERNEL_VERSION( 3,9,1 ))
/* make MAC addr easily distinguishable from an IP header */
if (possibly_iphdr(dev->net->dev_addr)) {
dev->net->dev_addr[0] |= 0x02; /* set local assignment bit */
dev->net->dev_addr[0] &= 0xbf; /* clear "IP" bit */
}
#endif
usb_control_msg(
interface_to_usbdev(intf),
usb_sndctrlpipe(interface_to_usbdev(intf), 0),
0x22, //USB_CDC_REQ_SET_CONTROL_LINE_STATE
0x21, //USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE
1, //active CDC DTR
intf->cur_altsetting->desc.bInterfaceNumber,
NULL, 0, 100);
}
#endif
err:
return status;
}
/* if follow struct exist, modify it as below */
static const struct driver_info qmi_wwan_info =
{
……
#if 1 //Added by Quectel
.tx_fixup = qmi_wwan_tx_fixup,
.rx_fixup = qmi_wwan_rx_fixup,
#endif
}
/* if follow struct exist, modify it as below */
static const struct driver_info qmi_wwan_force_int4 = {
……
#if 1 //Added by Quectel
.tx_fixup = qmi_wwan_tx_fixup,
.rx_fixup = qmi_wwan_rx_fixup,
#endif
};
(3)添加內核模塊
[*]Device Drivers
[*]Network device support
[*]USB Network Adapters
[*]Multi-purpose USB Networking Framework
<*>QMI WWAN driver for Qualcomm MSM based 3G and LTE modems
3.添加內核ppp
[*]Device Driver
[*]Network device support
[*]PPP (point-to-point protocol) support
4.電源管理
(1)自動掛起
/kernel/drivers/usb/serial/option.c
static int option_probe(struct usb_serial *serial, const struct usb_device_id *id) {
struct usb_wwan_intf_private *data;
……
#if 1 //Added by Quectel
//For USB Auto Suspend
if (serial->dev->descriptor.idVendor == cpu_to_le16(0x05C6) && serial->dev->descriptor.idProduct == cpu_to_le16(0x9090)) {
pm_runtime_set_autosuspend_delay(&serial->dev->dev, 3000);
usb_enable_autosuspend(serial->dev);
}
if (serial->dev->descriptor.idVendor == cpu_to_le16(0x05C6) && serial->dev->descriptor.idProduct == cpu_to_le16(0x9003)) {
pm_runtime_set_autosuspend_delay(&serial->dev->dev, 3000);
usb_enable_autosuspend(serial->dev);
}
if (serial->dev->descriptor.idVendor == cpu_to_le16(0x05C6) && serial->dev->descriptor.idProduct == cpu_to_le16(0x9215)) {
pm_runtime_set_autosuspend_delay(&serial->dev->dev, 3000);
usb_enable_autosuspend(serial->dev);
}
if (serial->dev->descriptor.idVendor == cpu_to_le16(0x2C7C)) {
pm_runtime_set_autosuspend_delay(&serial->dev->dev, 3000);
usb_enable_autosuspend(serial->dev);
}
#endif
/* Store device id so we can use it during attach. */
usb_set_serial_data(serial, (void *)id);
return 0;
}
(2)自動喚醒
/kernel/drivers/usb/serial/option.c
static int option_probe(struct usb_serial *serial, const struct usb_device_id *id) {
struct usb_wwan_intf_private *data;
……
#if 1 //Added by Quectel
//For USB Remote Wakeup
if (serial->dev->descriptor.idVendor == cpu_to_le16(0x05C6) && serial->dev->descriptor.idProduct == cpu_to_le16(0x9090)) {
device_init_wakeup(&serial->dev->dev, 1); //usb remote wakeup
}
if (serial->dev->descriptor.idVendor == cpu_to_le16(0x05C6) && serial->dev->descriptor.idProduct == cpu_to_le16(0x9003)) {
device_init_wakeup(&serial->dev->dev, 1); //usb remote wakeup
}
if (serial->dev->descriptor.idVendor == cpu_to_le16(0x05C6) && serial->dev->descriptor.idProduct == cpu_to_le16(0x9215)) {
device_init_wakeup(&serial->dev->dev, 1); //usb remote wakeup
}
if (serial->dev->descriptor.idVendor == cpu_to_le16(0x2C7C)) {
device_init_wakeup(&serial->dev->dev, 1); //usb remote wakeup
}
#endif
/* Store device id so we can use it during attach. */
usb_set_serial_data(serial, (void *)id);
return 0;
}
此時,驅動層相關已經添加完了。
如果是linux系統,再添加quectel-CM的撥號工具就可以了。
5.quectel-CM撥號
(1)移植quctel-CM源碼
放入/hardware/ril/reference-ril/路徑下;
(2)添加default.script腳本
android環境,命令udhcpc -h檢查版本調用路徑:
將default.script腳本放至該路徑(或/usr/share/udhcpc/),並注意執行權限。
權限:可在/system/core/libcutils/fs_config.c文件或init.rc文件中的on init中指定
(3)執行quectel-CM
將sudo quectel-CM -s ctnet 命令添加到腳本,並在/etc/init.d/rc中啓動腳本。
檢查IP/DNS/網關等配置,沒問題可以正常啓動。
二.android RIL庫
1.添加ril源碼
(1)移植ril源碼
放入/hardware/ril/reference-ril路徑
(2)指定rild庫路徑
/device/rockchip/rkxx/rkxxxxxx/system.prop
rild.llibpath=/system/lib64/libreference-ril.so
rild.libargs=-d /dev/ttyUSB2 //ttyUSB2是AT口
2.添加phone進程
源碼路徑:/packages/apps/PhoneCommon
添加編譯:/device/rockchip/rk3399/device.mk
PRODUCT_PACKAGES += com.android.phone.common
在/out/target/product/rkxxsdk/system/app/下出現com.android.phone.common
3.android系統設置
(1)添加ril-daemon服務到init.rc
/device/rockchip/rk3399/init.rc
service ril-daemon /system/bin/rild -l /system/lib/libreference-ril.so
class main
socket rild stream 660 root radio
socket rild-debug stream 660 radio system
user root
group radio cache inet misc audio sdcard_rw log
(android8及以上)
service ril-daemon /vendor/bin/hw/rild -l /vendor/lib64/libreference-ril.so
class main
user root
group radio cache inet misc audio sdcard_rw log
(2)保證rild的root權限
/hardware/ril/rild/rild.c
OpenLib:
#endif
//switchUser();
dlHandle = dlopen(rilLibPath, RTLD_NOW);
(3)添加APN
/device/rockchip/rkxx/rkxx.mk
PRODUT_COPY_FILES:= /vendor/rockchip/common/phone/etc/apns-full-conf.xml:system/etc/qpns-conf.xml
檢查該文件中是否包含所使用的運營商APN信息,如果沒有,添加上相應的APN信息。
比如:使用MCC/MNC來確認,而MCC/MNC的值是通過模塊查詢到的IMSI碼的前五位來確定的。
(4)打開dongle功能
/device/rockchip/common/BoardConfig.mk
BOARD_HAVE_DONGLE ?= true
(5)檢查
logcat -b radio -v time //查看log
getprop init.svc.ril-daemon //檢查ril守護進程Runing
cat init.rc | grep ril-daemon //檢查ril-daemon服務是否生效
getenforce //檢查SELinux是否開啓,<setenforce 0>命令關閉
getprop gsm.version.ril-impl //檢查ril版本,出現Quectel_Android_RIL_SR01A41V17,如未出現ril庫沒有添加上,或者檢查phone進程